Grinding device

ABSTRACT

A grinding device for grinding a cylinder that has a rotating shaft includes an immovable component, a movable component, and a grinding component. The immovable component has a positioning unit. The cylinder has the rotating shaft positioned by the positioning unit. The movable component has a carrying portion and is such installed on the immovable component that the movable component can move axially along the rotating shaft. The carrying portion positionally corresponds to the cylinder. The grinding component is located on the carrying portion and positionally corresponds to a surface of the rotating shaft. The grinding device thereby is able to grind the rotating shaft of the cylinder evenly with reduced labor costs.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to mechanical processing device, and moreparticularly to a grinding device for making cylinders or cylindricalworkpieces.

2. Description of Related Art

A conventional approach to grinding cylinders or cylindrical workpiecesis that workers use abrasive paper to manually grind the workpieces atwhere the workpieces will rotationally combined with other articles.However, the result of manual grinding is highly dependent on theworkers' skill and it is often seen that the grounded sites are notevenly and/or adequately processed. When such a ragged and/or roughcylinder (such as a rotor shaft) is applied or assembled as a part to amechanism (such as a motor), it is unlikely to fit the surrounding partswell, and the resultant poor combination can generate noise and/or evenhave adverse effects on the service life of the mechanism, in turncausing great trouble to the users. Therefore, the conventional approachneeds to be improved.

BRIEF SUMMARY OF THE INVENTION

In view of the aforementioned need, the primary objective of the presentinvention is to provide a grinding device that grinds cylinders withbetter quality and lower labor costs, and endows the ground cylinderswith improved evenness and fineness.

For achieving the objective as stated above, the disclosed grindingdevice is configured to grind a cylinder that has a rotating shaft. Thegrinding device comprises an immovable component, a movable component,and a grinding component. The immovable component has a positioningunit. The cylinder is such installed on the positioning unit that it isrotatable against the rotating shaft. The movable component has acarrying portion. The movable component is such installed on theimmovable component that it is axially movable along the rotating shaft.The carrying portion is positionally corresponding to the cylinder. Thegrinding component is located on the carrying portion and positionallycorresponding to a surface of the rotating shaft. Thereby, when thecylinder rotates against the rotating shaft, the grinding componentperipherally grinds peripherally grinds the surface of the rotatingshaft. When the movable component move axially along the rotating shaft,the grinding component also move axially along the rotating shaft of thecylinder and linearly grinds the surface of the rotating shaft, therebymaking the surface of the rotating shaft ground more evenly.

The invention as well as a preferred mode of use, further objectives andadvantages thereof will be best understood by reference to the followingdetailed description of illustrative embodiments when read inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a front view of a preferred embodiment of the presentinvention.

FIG. 2 is a side view of the preferred embodiment of the presentinvention, showing that the driving unit drives the cylinder to rotate.

FIG. 3 and FIG. 4 are front views of the preferred embodiment of thepresent invention, showing that the driven unit drives the movablecomponent.

FIG. 5 is a side view of the preferred embodiment of the presentinvention, showing that the driving unit is unable to drive the cylinderto rotate.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1 through FIG. 5, according to the present invention,a grinding device 10 used for grinding a cylinder 20 is disclosed. Inthe depicted preferred embodiment, the cylinder 20 is illustratively amotor rotor. The cylinder 20 has a rotating shaft 22. The grindingdevice 10 comprises an immovable component 30, a movable component 40,and two grinding components 50.

The immovable component 30 comprises a carrying surface 32, apositioning unit 34, a driving unit 36, and a driven unit 38. Thecarrying surface 32 is a smooth surface. The positioning unit 34 isdeposited on the carrying surface 32. The positioning unit 34 comprisestwo fixing shafts 342, two posts 343, and a positioning space 344. Thetwo posts 343 each have one end perpendicular installed on the carryingsurface 32. The two fixing shafts 342 are each located at the other endof the two post 343. The two fixing shafts 342 are axially aligned. Thepositioning space 344 is defined between the two fixing shafts 342. Thecylinder 20 is placed in the positioning space 344 and rotatable againstthe rotating shaft 22. The two fixing shafts 342 abut against two endsof the rotating shaft 22, so as to support the cylinder 20 to rotateagainst the rotating shaft 22.

The driving unit 36 comprises a first power source 362 and a drivingmember 364. The driving member 364 is pivotally movable between a firstposition P1 (as shown in FIG. 2) and a second position P2 (as shown inFIG. 5). The first power source 362 may be a motor or the like, forpowering the driving member 364 to act while the driving member 364 maybe a belt set or the like. When the driving member 364 is at the firstposition P1, the first power source 362 drives the driving member 364 toact. Since the driving member 364 is pressing upon the cylinder 20, thecylinder 20 is driven to rotate against the rotating shaft 22. When thedriving member 364 is at the second position P2, the driving member 364is away from the cylinder 20, and the cylinder 20 is not driven torotate. The driven unit 38 comprises a second power source 382 and a cam384. The second power source 382 powers the cam 384 to rotate.

The movable component 40 is installed on the carrying surface 32. Themovable component 40 comprises a carrying portion 42, a rail unit 44,and a frame 48. The movable component 40 slides on the rail unit 44 soas to move over the carrying surface 32. The carrying portion 42 ispositionally corresponding to the cylinder 20. The carrying portion 42has two symmetrically formed notches 422 for receiving the two ends ofthe rotating shaft 22 of the cylinder 20. The carrying portion 42 hastwo clip slots 46 each located by one of the two notches 422. The frame48 is provided beside the movable component 40, so that the cam 384 andthe frame 48 press against each other. Thereby, when the second powersource 382 drives the cam 384 to rotate, the cam 384 in turn drives themovable component 40 to move linearly to and fro along the carryingsurface 32.

The grinding component 50 may be abrasive paper, sand cloth or othermaterials having abrasive effects. The grinding component 50 may be inthe form of a flat sheet or a roll that can automatically expand or rollup. The grinding components 50 are held in the clip slots 46, so thatthe grinding components 50 are corresponding to the surfaces of the twoends of the rotating shaft 22 of the cylinder 20. When the two ends ofthe rotating shaft 22 of the cylinder 20 are received in the two notches422, the surfaces of the two ends of the rotating shaft 22 of thecylinder 20 abut against the two grinding components 50, respectively.

The technical features described above may be further explained withreference to FIG. 1 and FIG. 2. The cylinder 20 is placed on thecarrying portion 42 so that the surfaces of the two ends of the rotatingshaft 22 of the cylinder 20 contact the grinding components 50,respectively, and the two fixing shafts 342 abut against the two ends ofthe rotating shaft 22. When the driving member 364 is at the firstposition P1, the driving member 364 is pressing on the cylinder 20, sothe two ends of the rotating shaft 22 are pushed toward and therebypress more closely on the grinding components 50. Referring to FIG. 3and FIG. 4, when the first power source 362 drives the driving member364, the driving member 364 in turn drives the cylinder 20 to rotateagainst the rotating shaft 22, which allowing the grinding components 50to peripherally grind the surfaces of the two ends of the rotating shaft22. When the second power source 382 at the same time powers the cam 384to rotate, since the two ends of the rotating shaft 22 of the cylinder20 are propped by the two fixing shafts 342, the cam 384 in turn drivesthe frame 48 to make the entire carrying portion 42 to move axially toand fro along the rotating shaft 22. As a result, the grindingcomponents 50 move along the rotating shaft 22 of the cylinder 20 to andfro and linearly grind the surfaces of the two ends of the rotatingshaft 22, thereby achieving back and forth grinding.

It is to be restated that the conventional approach to grinding acylinder is that workers use abrasive paper to manually grind the axleof the workpiece and tends to cause ragged and/or rough ground surfacesof the cylinder. When such a cylinder (e.g. a rotor shaft) is applied orassembled as a part to a mechanism (e.g. a motor), it is unlikely to fitthe surrounding parts well, and the resultant poor combination cangenerate noise and/or even have adverse effects on the service life ofthe mechanism. However, the disclosed grinding device 10 uses themovable component 40 to work with the positioning unit 34, the drivingunit 36, and the driven unit 38, so as to provide both peripheral andlinear grinding to the rotating shaft 22 of the cylinder 20. Thereby,the disclosed grinding device can perform grinding with better qualityand lower labor costs, and endows the ground rotating shaft 22 withimproved evenness and fineness.

The present invention has been described with reference to the preferredembodiments and it is understood that the embodiments are not intendedto limit the scope of the present invention. Moreover, as the contentsdisclosed herein should be readily understood and can be implemented bya person skilled in the art, all equivalent changes or modificationswhich do not depart from the concept of the present invention should beencompassed by the appended claims.

What is claimed is:
 1. A grinding device, for grinding a cylinder thathas a rotating shaft, the grinding device comprising: an immovablecomponent, having a positioning unit on which the cylinder is suchmounted that the cylinder is rotatable against the rotating shaft; amovable component, having a carrying portion, wherein the movablecomponent is such installed that on the immovable component that themovable component is moveable axially along the rotating shaft, and thecarrying portion positionally corresponds to the cylinder; and agrinding component, being installed on the carrying portion andpositionally corresponding to a surface of the rotating shaft.
 2. Thegrinding device of claim 1, wherein the immovable component furthercomprises a carrying surface, and the positioning unit of the immovablecomponent comprises two posts, two fixing shafts, and a positioningspace, in which the two posts are installed on the carrying surface, andeach of the two fixing shafts is located on one end of one said post,while the positioning space is defined between the two fixing shafts, sothat when the cylinder is placed in the positioning space, the twofixing shafts abut against two ends of the rotating shaft of thecylinder, respectively.
 3. The grinding device of claim 1, wherein theimmovable component further comprises a driving unit that is configuredto drive the cylinder to rotate against the rotating shaft.
 4. Thegrinding device of claim 1, wherein the immovable component furthercomprises a driven unit that is configured to drive the movablecomponent to move axially to and fro along the rotating shaft.
 5. Thegrinding device of claim 1, wherein the carrying portion of the movablecomponent comprises two notches for receiving two ends of the rotatingshaft of the cylinder, respectively, and the grinding component islocated by the two notches and contacts the two ends of the rotatingshaft.
 6. The grinding device of claim 5, wherein each of the twonotches comprises a clip slot, and the grinding component is received inthe clip slots and contacts the surface of the rotating shaft.